305202421 has 2 divisors, whose sum is σ = 305202422. Its totient is φ = 305202420.

The previous prime is 305202407. The next prime is 305202473. The reversal of 305202421 is 124202503.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 305200900 + 1521 = 17470^2 + 39^2 .

It is an emirp because it is prime and its reverse (124202503) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 305202421 - 2¹¹ = 305200373 is a prime.

It is a super-2 number, since 2×305202421² = 186297035568522482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (305202481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152601210 + 152601211.

It is an arithmetic number, because the mean of its divisors is an integer number (152601211).

Almost surely, 2^305202421 is an apocalyptic number.

It is an amenable number.

305202421 is a deficient number, since it is larger than the sum of its proper divisors (1).

305202421 is an equidigital number, since it uses as much as digits as its factorization.

305202421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 305202421 is about 17470.0435317145. The cubic root of 305202421 is about 673.2804304143.

Adding to 305202421 its reverse (124202503), we get a palindrome (429404924).

The spelling of 305202421 in words is "three hundred five million, two hundred two thousand, four hundred twenty-one".